An engineer is designing a high-efficiency heating element for an electric vehicle cabin heater. To optimize the rate of electrical energy transfer (electrical power, PPP), they must use correct mathematical relationships.
Which row of the table shows two correct equations that can be used to calculate the electrical power P P\,P dissipated by a heating element of resistance RRR?
| Equation 1 | Equation 2 | |
|---|---|---|
| A | P=V2RP = V^2 RP=V2R | P=I2R\displaystyle P = \frac{I^2}{R}P=RI2 |
| B | P=V2R\displaystyle P = \frac{V^2}{R}P=RV2 | P=I2RP = I^2 RP=I2R |
| C | P=RV2\displaystyle P = \frac{R}{V^2}P=V2R | P=I2RP = I^2 RP=I2R |
| D | P=V2R\displaystyle P = \frac{V^2}{R}P=RV2 | P=IR2P = I R^2P=IR2 |
Row A
Row B
Row C
Row D
31 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.